[deliverable/linux.git] / drivers / i2c / busses / i2c-powermac.c

/*
    i2c Support for Apple SMU Controller

    Copyright (c) 2005 Benjamin Herrenschmidt, IBM Corp.
                       <benh@kernel.crashing.org>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

*/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/i2c.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/of_irq.h>
#include <asm/prom.h>
#include <asm/pmac_low_i2c.h>

MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
MODULE_DESCRIPTION("I2C driver for Apple PowerMac");
MODULE_LICENSE("GPL");

/*
 * SMBUS-type transfer entrypoint
 */
static s32 i2c_powermac_smbus_xfer(	struct i2c_adapter*	adap,
					u16			addr,
					unsigned short		flags,
					char			read_write,
					u8			command,
					int			size,
					union i2c_smbus_data*	data)
{
	struct pmac_i2c_bus	*bus = i2c_get_adapdata(adap);
	int			rc = 0;
	int			read = (read_write == I2C_SMBUS_READ);
	int			addrdir = (addr << 1) | read;
	int			mode, subsize, len;
	u32			subaddr;
	u8			*buf;
	u8			local[2];

	if (size == I2C_SMBUS_QUICK || size == I2C_SMBUS_BYTE) {
		mode = pmac_i2c_mode_std;
		subsize = 0;
		subaddr = 0;
	} else {
		mode = read ? pmac_i2c_mode_combined : pmac_i2c_mode_stdsub;
		subsize = 1;
		subaddr = command;
	}

	switch (size) {
        case I2C_SMBUS_QUICK:
		buf = NULL;
		len = 0;
	    	break;
        case I2C_SMBUS_BYTE:
        case I2C_SMBUS_BYTE_DATA:
		buf = &data->byte;
		len = 1;
	    	break;
        case I2C_SMBUS_WORD_DATA:
		if (!read) {
			local[0] = data->word & 0xff;
			local[1] = (data->word >> 8) & 0xff;
		}
		buf = local;
		len = 2;
	    	break;

	/* Note that these are broken vs. the expected smbus API where
	 * on reads, the length is actually returned from the function,
	 * but I think the current API makes no sense and I don't want
	 * any driver that I haven't verified for correctness to go
	 * anywhere near a pmac i2c bus anyway ...
	 *
	 * I'm also not completely sure what kind of phases to do between
	 * the actual command and the data (what I am _supposed_ to do that
	 * is). For now, I assume writes are a single stream and reads have
	 * a repeat start/addr phase (but not stop in between)
	 */
        case I2C_SMBUS_BLOCK_DATA:
		buf = data->block;
		len = data->block[0] + 1;
		break;
	case I2C_SMBUS_I2C_BLOCK_DATA:
		buf = &data->block[1];
		len = data->block[0];
		break;

        default:
		return -EINVAL;
	}

	rc = pmac_i2c_open(bus, 0);
	if (rc) {
		dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
		return rc;
	}

	rc = pmac_i2c_setmode(bus, mode);
	if (rc) {
		dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
			mode, rc);
		goto bail;
	}

	rc = pmac_i2c_xfer(bus, addrdir, subsize, subaddr, buf, len);
	if (rc) {
		if (rc == -ENXIO)
			dev_dbg(&adap->dev,
				"I2C transfer at 0x%02x failed, size %d, "
				"err %d\n", addrdir >> 1, size, rc);
		else
			dev_err(&adap->dev,
				"I2C transfer at 0x%02x failed, size %d, "
				"err %d\n", addrdir >> 1, size, rc);
		goto bail;
	}

	if (size == I2C_SMBUS_WORD_DATA && read) {
		data->word = ((u16)local[1]) << 8;
		data->word |= local[0];
	}

 bail:
	pmac_i2c_close(bus);
	return rc;
}

/*
 * Generic i2c master transfer entrypoint. This driver only support single
 * messages (for "lame i2c" transfers). Anything else should use the smbus
 * entry point
 */
static int i2c_powermac_master_xfer(	struct i2c_adapter *adap,
					struct i2c_msg *msgs,
					int num)
{
	struct pmac_i2c_bus	*bus = i2c_get_adapdata(adap);
	int			rc = 0;
	int			read;
	int			addrdir;

	if (num != 1) {
		dev_err(&adap->dev,
			"Multi-message I2C transactions not supported\n");
		return -EOPNOTSUPP;
	}

	if (msgs->flags & I2C_M_TEN)
		return -EINVAL;
	read = (msgs->flags & I2C_M_RD) != 0;
	addrdir = (msgs->addr << 1) | read;

	rc = pmac_i2c_open(bus, 0);
	if (rc) {
		dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
		return rc;
	}
	rc = pmac_i2c_setmode(bus, pmac_i2c_mode_std);
	if (rc) {
		dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
			pmac_i2c_mode_std, rc);
		goto bail;
	}
	rc = pmac_i2c_xfer(bus, addrdir, 0, 0, msgs->buf, msgs->len);
	if (rc < 0) {
		if (rc == -ENXIO)
			dev_dbg(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
				addrdir & 1 ? "read from" : "write to",
				addrdir >> 1, rc);
		else
			dev_err(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
				addrdir & 1 ? "read from" : "write to",
				addrdir >> 1, rc);
	}
 bail:
	pmac_i2c_close(bus);
	return rc < 0 ? rc : 1;
}

static u32 i2c_powermac_func(struct i2c_adapter * adapter)
{
	return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
		I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
		I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_I2C;
}

/* For now, we only handle smbus */
static const struct i2c_algorithm i2c_powermac_algorithm = {
	.smbus_xfer	= i2c_powermac_smbus_xfer,
	.master_xfer	= i2c_powermac_master_xfer,
	.functionality	= i2c_powermac_func,
};


static int i2c_powermac_remove(struct platform_device *dev)
{
	struct i2c_adapter	*adapter = platform_get_drvdata(dev);

	i2c_del_adapter(adapter);
	memset(adapter, 0, sizeof(*adapter));

	return 0;
}

static u32 i2c_powermac_get_addr(struct i2c_adapter *adap,
					   struct pmac_i2c_bus *bus,
					   struct device_node *node)
{
	const __be32 *prop;
	int len;

	/* First check for valid "reg" */
	prop = of_get_property(node, "reg", &len);
	if (prop && (len >= sizeof(int)))
		return (be32_to_cpup(prop) & 0xff) >> 1;

	/* Then check old-style "i2c-address" */
	prop = of_get_property(node, "i2c-address", &len);
	if (prop && (len >= sizeof(int)))
		return (be32_to_cpup(prop) & 0xff) >> 1;

	/* Now handle some devices with missing "reg" properties */
	if (!strcmp(node->name, "cereal"))
		return 0x60;
	else if (!strcmp(node->name, "deq"))
		return 0x34;

	dev_warn(&adap->dev, "No i2c address for %s\n", node->full_name);

	return 0xffffffff;
}

static void i2c_powermac_create_one(struct i2c_adapter *adap,
					      const char *type,
					      u32 addr)
{
	struct i2c_board_info info = {};
	struct i2c_client *newdev;

	strncpy(info.type, type, sizeof(info.type));
	info.addr = addr;
	newdev = i2c_new_device(adap, &info);
	if (!newdev)
		dev_err(&adap->dev,
			"i2c-powermac: Failure to register missing %s\n",
			type);
}

static void i2c_powermac_add_missing(struct i2c_adapter *adap,
					       struct pmac_i2c_bus *bus,
					       bool found_onyx)
{
	struct device_node *busnode = pmac_i2c_get_bus_node(bus);
	int rc;

	/* Check for the onyx audio codec */
#define ONYX_REG_CONTROL		67
	if (of_device_is_compatible(busnode, "k2-i2c") && !found_onyx) {
		union i2c_smbus_data data;

		rc = i2c_smbus_xfer(adap, 0x46, 0, I2C_SMBUS_READ,
				    ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
				    &data);
		if (rc >= 0)
			i2c_powermac_create_one(adap, "MAC,pcm3052", 0x46);

		rc = i2c_smbus_xfer(adap, 0x47, 0, I2C_SMBUS_READ,
				    ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
				    &data);
		if (rc >= 0)
			i2c_powermac_create_one(adap, "MAC,pcm3052", 0x47);
	}
}

static bool i2c_powermac_get_type(struct i2c_adapter *adap,
					    struct device_node *node,
					    u32 addr, char *type, int type_size)
{
	char tmp[16];

	/* Note: we to _NOT_ want the standard
	 * i2c drivers to match with any of our powermac stuff
	 * unless they have been specifically modified to handle
	 * it on a case by case basis. For example, for thermal
	 * control, things like lm75 etc... shall match with their
	 * corresponding windfarm drivers, _NOT_ the generic ones,
	 * so we force a prefix of AAPL, onto the modalias to
	 * make that happen
	 */

	/* First try proper modalias */
	if (of_modalias_node(node, tmp, sizeof(tmp)) >= 0) {
		snprintf(type, type_size, "MAC,%s", tmp);
		return true;
	}

	/* Now look for known workarounds */
	if (!strcmp(node->name, "deq")) {
		/* Apple uses address 0x34 for TAS3001 and 0x35 for TAS3004 */
		if (addr == 0x34) {
			snprintf(type, type_size, "MAC,tas3001");
			return true;
		} else if (addr == 0x35) {
			snprintf(type, type_size, "MAC,tas3004");
			return true;
		}
	}

	dev_err(&adap->dev, "i2c-powermac: modalias failure"
		" on %s\n", node->full_name);
	return false;
}

static void i2c_powermac_register_devices(struct i2c_adapter *adap,
						    struct pmac_i2c_bus *bus)
{
	struct i2c_client *newdev;
	struct device_node *node;
	bool found_onyx = 0;

	/*
	 * In some cases we end up with the via-pmu node itself, in this
	 * case we skip this function completely as the device-tree will
	 * not contain anything useful.
	 */
	if (!strcmp(adap->dev.of_node->name, "via-pmu"))
		return;

	for_each_child_of_node(adap->dev.of_node, node) {
		struct i2c_board_info info = {};
		u32 addr;

		/* Get address & channel */
		addr = i2c_powermac_get_addr(adap, bus, node);
		if (addr == 0xffffffff)
			continue;

		/* Multibus setup, check channel */
		if (!pmac_i2c_match_adapter(node, adap))
			continue;

		dev_dbg(&adap->dev, "i2c-powermac: register %s\n",
			node->full_name);

		/*
		 * Keep track of some device existence to handle
		 * workarounds later.
		 */
		if (of_device_is_compatible(node, "pcm3052"))
			found_onyx = true;

		/* Make up a modalias */
		if (!i2c_powermac_get_type(adap, node, addr,
					   info.type, sizeof(info.type))) {
			continue;
		}

		/* Fill out the rest of the info structure */
		info.addr = addr;
		info.irq = irq_of_parse_and_map(node, 0);
		info.of_node = of_node_get(node);

		newdev = i2c_new_device(adap, &info);
		if (!newdev) {
			dev_err(&adap->dev, "i2c-powermac: Failure to register"
				" %s\n", node->full_name);
			of_node_put(node);
			/* We do not dispose of the interrupt mapping on
			 * purpose. It's not necessary (interrupt cannot be
			 * re-used) and somebody else might have grabbed it
			 * via direct DT lookup so let's not bother
			 */
			continue;
		}
	}

	/* Additional workarounds */
	i2c_powermac_add_missing(adap, bus, found_onyx);
}

static int i2c_powermac_probe(struct platform_device *dev)
{
	struct pmac_i2c_bus *bus = dev_get_platdata(&dev->dev);
	struct device_node *parent = NULL;
	struct i2c_adapter *adapter;
	const char *basename;
	int rc;

	if (bus == NULL)
		return -EINVAL;
	adapter = pmac_i2c_get_adapter(bus);

	/* Ok, now we need to make up a name for the interface that will
	 * match what we used to do in the past, that is basically the
	 * controller's parent device node for keywest. PMU didn't have a
	 * naming convention and SMU has a different one
	 */
	switch(pmac_i2c_get_type(bus)) {
	case pmac_i2c_bus_keywest:
		parent = of_get_parent(pmac_i2c_get_controller(bus));
		if (parent == NULL)
			return -EINVAL;
		basename = parent->name;
		break;
	case pmac_i2c_bus_pmu:
		basename = "pmu";
		break;
	case pmac_i2c_bus_smu:
		/* This is not what we used to do but I'm fixing drivers at
		 * the same time as this change
		 */
		basename = "smu";
		break;
	default:
		return -EINVAL;
	}
	snprintf(adapter->name, sizeof(adapter->name), "%s %d", basename,
		 pmac_i2c_get_channel(bus));
	of_node_put(parent);

	platform_set_drvdata(dev, adapter);
	adapter->algo = &i2c_powermac_algorithm;
	i2c_set_adapdata(adapter, bus);
	adapter->dev.parent = &dev->dev;

	/* Clear of_node to skip automatic registration of i2c child nodes */
	adapter->dev.of_node = NULL;
	rc = i2c_add_adapter(adapter);
	if (rc) {
		printk(KERN_ERR "i2c-powermac: Adapter %s registration "
		       "failed\n", adapter->name);
		memset(adapter, 0, sizeof(*adapter));
		return rc;
	}

	printk(KERN_INFO "PowerMac i2c bus %s registered\n", adapter->name);

	/* Use custom child registration due to Apple device-tree funkyness */
	adapter->dev.of_node = dev->dev.of_node;
	i2c_powermac_register_devices(adapter, bus);

	return 0;
}

static struct platform_driver i2c_powermac_driver = {
	.probe = i2c_powermac_probe,
	.remove = i2c_powermac_remove,
	.driver = {
		.name = "i2c-powermac",
		.bus = &platform_bus_type,
	},
};

module_platform_driver(i2c_powermac_driver);

MODULE_ALIAS("platform:i2c-powermac");
Commit	Line	Data
a28d3af2 BH	1	/*
	2	i2c Support for Apple SMU Controller
	3
	4	Copyright (c) 2005 Benjamin Herrenschmidt, IBM Corp.
	5	<benh@kernel.crashing.org>
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 2 of the License, or
	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
a28d3af2 BH	17	*/
a28d3af2 BH	18
a28d3af2 BH	19	#include <linux/module.h>
	20	#include <linux/kernel.h>
	21	#include <linux/types.h>
	22	#include <linux/i2c.h>
a28d3af2 BH	23	#include <linux/device.h>
a28d3af2 BH	24	#include <linux/platform_device.h>
5af50730	25	#include <linux/of_irq.h>
a28d3af2 BH	26	#include <asm/prom.h>
	27	#include <asm/pmac_low_i2c.h>
	28
	29	MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
	30	MODULE_DESCRIPTION("I2C driver for Apple PowerMac");
	31	MODULE_LICENSE("GPL");
	32
	33	/*
	34	* SMBUS-type transfer entrypoint
	35	*/
	36	static s32 i2c_powermac_smbus_xfer( struct i2c_adapter* adap,
	37	u16 addr,
	38	unsigned short flags,
	39	char read_write,
	40	u8 command,
	41	int size,
	42	union i2c_smbus_data* data)
	43	{
	44	struct pmac_i2c_bus *bus = i2c_get_adapdata(adap);
	45	int rc = 0;
	46	int read = (read_write == I2C_SMBUS_READ);
	47	int addrdir = (addr << 1) \| read;
02864d58 JD	48	int mode, subsize, len;
	49	u32 subaddr;
	50	u8 *buf;
a28d3af2 BH	51	u8 local[2];
a28d3af2 BH	52
02864d58 JD	53	if (size == I2C_SMBUS_QUICK \|\| size == I2C_SMBUS_BYTE) {
	54	mode = pmac_i2c_mode_std;
	55	subsize = 0;
	56	subaddr = 0;
	57	} else {
	58	mode = read ? pmac_i2c_mode_combined : pmac_i2c_mode_stdsub;
	59	subsize = 1;
	60	subaddr = command;
	61	}
a28d3af2 BH	62
	63	switch (size) {
	64	case I2C_SMBUS_QUICK:
02864d58 JD	65	buf = NULL;
02864d58 JD	66	len = 0;
a28d3af2 BH	67	break;
a28d3af2 BH	68	case I2C_SMBUS_BYTE:
a28d3af2	69	case I2C_SMBUS_BYTE_DATA:
02864d58 JD	70	buf = &data->byte;
02864d58 JD	71	len = 1;
a28d3af2 BH	72	break;
a28d3af2 BH	73	case I2C_SMBUS_WORD_DATA:
a28d3af2 BH	74	if (!read) {
	75	local[0] = data->word & 0xff;
	76	local[1] = (data->word >> 8) & 0xff;
	77	}
02864d58 JD	78	buf = local;
02864d58 JD	79	len = 2;
a28d3af2 BH	80	break;
	81
	82	/* Note that these are broken vs. the expected smbus API where
96acafe0	83	* on reads, the length is actually returned from the function,
a28d3af2 BH	84	* but I think the current API makes no sense and I don't want
	85	* any driver that I haven't verified for correctness to go
	86	* anywhere near a pmac i2c bus anyway ...
	87	*
	88	* I'm also not completely sure what kind of phases to do between
	89	* the actual command and the data (what I am _supposed_ to do that
	90	* is). For now, I assume writes are a single stream and reads have
	91	* a repeat start/addr phase (but not stop in between)
	92	*/
	93	case I2C_SMBUS_BLOCK_DATA:
02864d58 JD	94	buf = data->block;
02864d58 JD	95	len = data->block[0] + 1;
a28d3af2 BH	96	break;
a28d3af2 BH	97	case I2C_SMBUS_I2C_BLOCK_DATA:
02864d58 JD	98	buf = &data->block[1];
02864d58 JD	99	len = data->block[0];
a28d3af2 BH	100	break;
	101
	102	default:
02864d58	103	return -EINVAL;
a28d3af2	104	}
02864d58 JD	105
02864d58 JD	106	rc = pmac_i2c_open(bus, 0);
d7d838a6 JD	107	if (rc) {
d7d838a6 JD	108	dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
02864d58	109	return rc;
d7d838a6	110	}
02864d58 JD	111
02864d58 JD	112	rc = pmac_i2c_setmode(bus, mode);
d7d838a6 JD	113	if (rc) {
	114	dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
	115	mode, rc);
02864d58	116	goto bail;
d7d838a6	117	}
02864d58 JD	118
02864d58 JD	119	rc = pmac_i2c_xfer(bus, addrdir, subsize, subaddr, buf, len);
d7d838a6	120	if (rc) {
8e4b980c JD	121	if (rc == -ENXIO)
	122	dev_dbg(&adap->dev,
	123	"I2C transfer at 0x%02x failed, size %d, "
	124	"err %d\n", addrdir >> 1, size, rc);
	125	else
	126	dev_err(&adap->dev,
	127	"I2C transfer at 0x%02x failed, size %d, "
	128	"err %d\n", addrdir >> 1, size, rc);
02864d58	129	goto bail;
d7d838a6	130	}
02864d58 JD	131
	132	if (size == I2C_SMBUS_WORD_DATA && read) {
	133	data->word = ((u16)local[1]) << 8;
	134	data->word \|= local[0];
	135	}
	136
a28d3af2 BH	137	bail:
	138	pmac_i2c_close(bus);
	139	return rc;
	140	}
	141
	142	/*
	143	* Generic i2c master transfer entrypoint. This driver only support single
	144	* messages (for "lame i2c" transfers). Anything else should use the smbus
	145	* entry point
	146	*/
	147	static int i2c_powermac_master_xfer( struct i2c_adapter *adap,
	148	struct i2c_msg *msgs,
	149	int num)
	150	{
	151	struct pmac_i2c_bus *bus = i2c_get_adapdata(adap);
	152	int rc = 0;
	153	int read;
	154	int addrdir;
	155
6f7e549f JD	156	if (num != 1) {
	157	dev_err(&adap->dev,
	158	"Multi-message I2C transactions not supported\n");
	159	return -EOPNOTSUPP;
	160	}
	161
a28d3af2 BH	162	if (msgs->flags & I2C_M_TEN)
	163	return -EINVAL;
	164	read = (msgs->flags & I2C_M_RD) != 0;
	165	addrdir = (msgs->addr << 1) \| read;
a28d3af2 BH	166
a28d3af2 BH	167	rc = pmac_i2c_open(bus, 0);
d7d838a6 JD	168	if (rc) {
d7d838a6 JD	169	dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
a28d3af2	170	return rc;
d7d838a6	171	}
a28d3af2	172	rc = pmac_i2c_setmode(bus, pmac_i2c_mode_std);
d7d838a6 JD	173	if (rc) {
	174	dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
	175	pmac_i2c_mode_std, rc);
a28d3af2	176	goto bail;
d7d838a6	177	}
a28d3af2	178	rc = pmac_i2c_xfer(bus, addrdir, 0, 0, msgs->buf, msgs->len);
8e4b980c JD	179	if (rc < 0) {
	180	if (rc == -ENXIO)
	181	dev_dbg(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
	182	addrdir & 1 ? "read from" : "write to",
	183	addrdir >> 1, rc);
	184	else
	185	dev_err(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
	186	addrdir & 1 ? "read from" : "write to",
	187	addrdir >> 1, rc);
	188	}
a28d3af2 BH	189	bail:
a28d3af2 BH	190	pmac_i2c_close(bus);
8ced8eee	191	return rc < 0 ? rc : 1;
a28d3af2 BH	192	}
	193
	194	static u32 i2c_powermac_func(struct i2c_adapter * adapter)
	195	{
	196	return I2C_FUNC_SMBUS_QUICK \| I2C_FUNC_SMBUS_BYTE \|
	197	I2C_FUNC_SMBUS_BYTE_DATA \| I2C_FUNC_SMBUS_WORD_DATA \|
	198	I2C_FUNC_SMBUS_BLOCK_DATA \| I2C_FUNC_I2C;
	199	}
	200
	201	/* For now, we only handle smbus */
8f9082c5	202	static const struct i2c_algorithm i2c_powermac_algorithm = {
a28d3af2 BH	203	.smbus_xfer = i2c_powermac_smbus_xfer,
	204	.master_xfer = i2c_powermac_master_xfer,
	205	.functionality = i2c_powermac_func,
	206	};
	207
	208
0b255e92	209	static int i2c_powermac_remove(struct platform_device *dev)
a28d3af2	210	{
9f2545c1	211	struct i2c_adapter *adapter = platform_get_drvdata(dev);
bf51a8c5 LPC	212
bf51a8c5 LPC	213	i2c_del_adapter(adapter);
6dfa5ca3	214	memset(adapter, 0, sizeof(*adapter));
a28d3af2 BH	215
	216	return 0;
	217	}
	218
0b255e92	219	static u32 i2c_powermac_get_addr(struct i2c_adapter *adap,
3a3dd018 BH	220	struct pmac_i2c_bus *bus,
	221	struct device_node *node)
	222	{
	223	const __be32 *prop;
	224	int len;
	225
	226	/* First check for valid "reg" */
	227	prop = of_get_property(node, "reg", &len);
	228	if (prop && (len >= sizeof(int)))
	229	return (be32_to_cpup(prop) & 0xff) >> 1;
	230
	231	/* Then check old-style "i2c-address" */
	232	prop = of_get_property(node, "i2c-address", &len);
	233	if (prop && (len >= sizeof(int)))
	234	return (be32_to_cpup(prop) & 0xff) >> 1;
	235
	236	/* Now handle some devices with missing "reg" properties */
	237	if (!strcmp(node->name, "cereal"))
	238	return 0x60;
	239	else if (!strcmp(node->name, "deq"))
	240	return 0x34;
	241
	242	dev_warn(&adap->dev, "No i2c address for %s\n", node->full_name);
	243
	244	return 0xffffffff;
	245	}
	246
0b255e92	247	static void i2c_powermac_create_one(struct i2c_adapter *adap,
3a3dd018 BH	248	const char *type,
	249	u32 addr)
	250	{
	251	struct i2c_board_info info = {};
	252	struct i2c_client *newdev;
	253
	254	strncpy(info.type, type, sizeof(info.type));
	255	info.addr = addr;
	256	newdev = i2c_new_device(adap, &info);
	257	if (!newdev)
	258	dev_err(&adap->dev,
	259	"i2c-powermac: Failure to register missing %s\n",
	260	type);
	261	}
	262
0b255e92	263	static void i2c_powermac_add_missing(struct i2c_adapter *adap,
3a3dd018 BH	264	struct pmac_i2c_bus *bus,
	265	bool found_onyx)
	266	{
	267	struct device_node *busnode = pmac_i2c_get_bus_node(bus);
	268	int rc;
	269
	270	/* Check for the onyx audio codec */
	271	#define ONYX_REG_CONTROL 67
	272	if (of_device_is_compatible(busnode, "k2-i2c") && !found_onyx) {
	273	union i2c_smbus_data data;
	274
	275	rc = i2c_smbus_xfer(adap, 0x46, 0, I2C_SMBUS_READ,
	276	ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
	277	&data);
	278	if (rc >= 0)
	279	i2c_powermac_create_one(adap, "MAC,pcm3052", 0x46);
	280
	281	rc = i2c_smbus_xfer(adap, 0x47, 0, I2C_SMBUS_READ,
	282	ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
	283	&data);
	284	if (rc >= 0)
	285	i2c_powermac_create_one(adap, "MAC,pcm3052", 0x47);
	286	}
	287	}
	288
0b255e92	289	static bool i2c_powermac_get_type(struct i2c_adapter *adap,
3a3dd018 BH	290	struct device_node *node,
	291	u32 addr, char *type, int type_size)
	292	{
	293	char tmp[16];
	294
	295	/* Note: we to _NOT_ want the standard
	296	* i2c drivers to match with any of our powermac stuff
	297	* unless they have been specifically modified to handle
	298	* it on a case by case basis. For example, for thermal
	299	* control, things like lm75 etc... shall match with their
	300	* corresponding windfarm drivers, _NOT_ the generic ones,
	301	* so we force a prefix of AAPL, onto the modalias to
	302	* make that happen
	303	*/
	304
	305	/* First try proper modalias */
	306	if (of_modalias_node(node, tmp, sizeof(tmp)) >= 0) {
	307	snprintf(type, type_size, "MAC,%s", tmp);
	308	return true;
	309	}
	310
	311	/* Now look for known workarounds */
	312	if (!strcmp(node->name, "deq")) {
	313	/* Apple uses address 0x34 for TAS3001 and 0x35 for TAS3004 */
	314	if (addr == 0x34) {
	315	snprintf(type, type_size, "MAC,tas3001");
	316	return true;
	317	} else if (addr == 0x35) {
	318	snprintf(type, type_size, "MAC,tas3004");
	319	return true;
	320	}
	321	}
	322
	323	dev_err(&adap->dev, "i2c-powermac: modalias failure"
	324	" on %s\n", node->full_name);
	325	return false;
	326	}
	327
0b255e92	328	static void i2c_powermac_register_devices(struct i2c_adapter *adap,
81e5d864 BH	329	struct pmac_i2c_bus *bus)
	330	{
	331	struct i2c_client *newdev;
	332	struct device_node *node;
3a3dd018 BH	333	bool found_onyx = 0;
	334
	335	/*
	336	* In some cases we end up with the via-pmu node itself, in this
	337	* case we skip this function completely as the device-tree will
	338	* not contain anything useful.
	339	*/
	340	if (!strcmp(adap->dev.of_node->name, "via-pmu"))
	341	return;
81e5d864 BH	342
	343	for_each_child_of_node(adap->dev.of_node, node) {
	344	struct i2c_board_info info = {};
81e5d864	345	u32 addr;
81e5d864 BH	346
81e5d864 BH	347	/* Get address & channel */
3a3dd018 BH	348	addr = i2c_powermac_get_addr(adap, bus, node);
3a3dd018 BH	349	if (addr == 0xffffffff)
81e5d864	350	continue;
81e5d864 BH	351
	352	/* Multibus setup, check channel */
	353	if (!pmac_i2c_match_adapter(node, adap))
	354	continue;
	355
	356	dev_dbg(&adap->dev, "i2c-powermac: register %s\n",
	357	node->full_name);
	358
3a3dd018 BH	359	/*
	360	* Keep track of some device existence to handle
	361	* workarounds later.
81e5d864	362	*/
3a3dd018 BH	363	if (of_device_is_compatible(node, "pcm3052"))
	364	found_onyx = true;
	365
	366	/* Make up a modalias */
	367	if (!i2c_powermac_get_type(adap, node, addr,
	368	info.type, sizeof(info.type))) {
81e5d864 BH	369	continue;
81e5d864 BH	370	}
81e5d864 BH	371
81e5d864 BH	372	/* Fill out the rest of the info structure */
3a3dd018	373	info.addr = addr;
81e5d864 BH	374	info.irq = irq_of_parse_and_map(node, 0);
81e5d864 BH	375	info.of_node = of_node_get(node);
81e5d864 BH	376
	377	newdev = i2c_new_device(adap, &info);
	378	if (!newdev) {
	379	dev_err(&adap->dev, "i2c-powermac: Failure to register"
	380	" %s\n", node->full_name);
	381	of_node_put(node);
	382	/* We do not dispose of the interrupt mapping on
	383	* purpose. It's not necessary (interrupt cannot be
	384	* re-used) and somebody else might have grabbed it
	385	* via direct DT lookup so let's not bother
	386	*/
	387	continue;
	388	}
	389	}
3a3dd018 BH	390
	391	/* Additional workarounds */
	392	i2c_powermac_add_missing(adap, bus, found_onyx);
81e5d864	393	}
a28d3af2	394
0b255e92	395	static int i2c_powermac_probe(struct platform_device *dev)
a28d3af2	396	{
6d4028c6	397	struct pmac_i2c_bus *bus = dev_get_platdata(&dev->dev);
a28d3af2 BH	398	struct device_node *parent = NULL;
a28d3af2 BH	399	struct i2c_adapter *adapter;
018a3d1d	400	const char *basename;
a28d3af2 BH	401	int rc;
	402
	403	if (bus == NULL)
	404	return -EINVAL;
bc6286e5	405	adapter = pmac_i2c_get_adapter(bus);
a28d3af2 BH	406
	407	/* Ok, now we need to make up a name for the interface that will
	408	* match what we used to do in the past, that is basically the
	409	* controller's parent device node for keywest. PMU didn't have a
	410	* naming convention and SMU has a different one
	411	*/
	412	switch(pmac_i2c_get_type(bus)) {
	413	case pmac_i2c_bus_keywest:
	414	parent = of_get_parent(pmac_i2c_get_controller(bus));
	415	if (parent == NULL)
	416	return -EINVAL;
	417	basename = parent->name;
	418	break;
	419	case pmac_i2c_bus_pmu:
	420	basename = "pmu";
	421	break;
	422	case pmac_i2c_bus_smu:
	423	/* This is not what we used to do but I'm fixing drivers at
	424	* the same time as this change
	425	*/
	426	basename = "smu";
	427	break;
	428	default:
	429	return -EINVAL;
	430	}
bc6286e5 JD	431	snprintf(adapter->name, sizeof(adapter->name), "%s %d", basename,
bc6286e5 JD	432	pmac_i2c_get_channel(bus));
a28d3af2 BH	433	of_node_put(parent);
a28d3af2 BH	434
9f2545c1	435	platform_set_drvdata(dev, adapter);
a28d3af2 BH	436	adapter->algo = &i2c_powermac_algorithm;
a28d3af2 BH	437	i2c_set_adapdata(adapter, bus);
9f2545c1	438	adapter->dev.parent = &dev->dev;
687b81d0 WS	439
	440	/* Clear of_node to skip automatic registration of i2c child nodes */
	441	adapter->dev.of_node = NULL;
a28d3af2 BH	442	rc = i2c_add_adapter(adapter);
	443	if (rc) {
	444	printk(KERN_ERR "i2c-powermac: Adapter %s registration "
bc6286e5	445	"failed\n", adapter->name);
6dfa5ca3	446	memset(adapter, 0, sizeof(*adapter));
874e955b	447	return rc;
a28d3af2 BH	448	}
a28d3af2 BH	449
bc6286e5	450	printk(KERN_INFO "PowerMac i2c bus %s registered\n", adapter->name);
810ad7b6	451
687b81d0 WS	452	/* Use custom child registration due to Apple device-tree funkyness */
687b81d0 WS	453	adapter->dev.of_node = dev->dev.of_node;
81e5d864	454	i2c_powermac_register_devices(adapter, bus);
810ad7b6	455
874e955b	456	return 0;
a28d3af2 BH	457	}
a28d3af2 BH	458
9f2545c1	459	static struct platform_driver i2c_powermac_driver = {
a28d3af2	460	.probe = i2c_powermac_probe,
0b255e92	461	.remove = i2c_powermac_remove,
9f2545c1 BH	462	.driver = {
	463	.name = "i2c-powermac",
	464	.bus = &platform_bus_type,
	465	},
a28d3af2 BH	466	};
a28d3af2 BH	467
a3664b51	468	module_platform_driver(i2c_powermac_driver);
a28d3af2	469
a3664b51	470	MODULE_ALIAS("platform:i2c-powermac");